I'd bet the C is his attempt to "help you" to communicate better with him!!! He doesn't get that you are angry, and don't want to "get over it" right now.
I think you have to think about what the counselling will do for you, if you want to go at the moment. Do you want to work through your anger so you 2 can be friends while he is with OW? Do you want to find a way to give him more opportunities to co-parent while you go through this? Do you want a forum in which you 2 can discuss business with a 3rd person present so that you can get that going without it being too emotional? And so on.
If you're just angry and want to stay dim/dark while you get stronger, then put off the C for a little while. He needs to "see" you as a strong woman when you go in there with him. A few weeks is unlikely to make any difference in the grand scheme of all this, but could help you be stronger. Even months seem to make no difference, as you and I know
